Frank Sinatra married actress Ava Gardner. Frank met Ava while still married to his first wife Nancy (Barbato) Sinatra. Their relationship was termutulous and their names could often ben found in the gossip magazines:

“The scrapping, in fact, never seemed to stop. “He has a temper that bursts into flames,” said Gardner, “while my temper burns inside for hours.” They quarreled over politics, music and, of course, other lovers. Frank was insanely jealous of Ava’s second ex-husband, bandleader Artie Shaw (Mickey Rooney was her first). When he found Shaw with her one night in 1950, Sinatra fired two shots—into his own mattress. For her part, Ava wanted Frank to get out of his unspooling 11-year marriage (Frank dragged his heels), and she once stormed out of a club when she thought Sinatra was singing to actress Marilyn Maxwell. “We were always great in bed,” the salty Gardner once said. “The trouble usually started on the way to the bidet.””
–People

They divorced in 1957.